Quantinuum debuts on Nasdaq at $68 share as market cap tops $15.7bn

Quantinuum, the quantum computing unit of US multinational Honeywell, has gone public, raising $1.68 billion from the sale of 28 million shares.

The company, which had initially priced its shares at $60 – a figure that was already above its earlier range of $53-$55 – opened trading at $68 a share. The price then rose to $71.35, before eventually closing at $60.38 on May 14, giving it a market value of $15.7bn.

In a post on LinkedIn, Quantinuum wrote: “Today’s milestone is the direct result of the dedication of our team, the trust of our partners, and the support of the entire quantum community. While this marks the completion of an incredible chapter in our journey, it also represents the beginning of a new one.

“We believe Quantum computing is one of the most profound technological ambitions of our time. We believe the full impact of what our technology can achieve will extend far beyond today’s identified use cases, reshaping industries and redefining what is computationally possible.“

The company also noted that it was the first quantum computing company to go public via a “traditional IPO.” Rival quantum firms D-Wave, IonQ, Infleqtion, Rigetti, and Xanadu Quantum Technologies are all publicly traded but went public via Special Purpose Acquisition Company (SPAC) mergers.

Quantum companies IQM Quantum Computers and Pasqal also announced this year plans to go public via SPAC mergers.

Quantinuum was founded in 2021 when Honeywell spun out its Quantum Solutions division and merged it with UK quantum computing startup Cambridge Quantum Computing. Honeywell owns a 54 percent stake in the company, and IBM is also an investor.

In November 2025, Quantinuum launched Helios, a general-purpose quantum computer that allows developers to program quantum and heterogeneous classical computers in the same way, therefore enabling hybrid quantum capabilities to be combined in a single program.

That same month, the US government’s Defense Advanced Research Projects Agency (DARPA) announced that Quantinuum had advanced to Stage B of its Quantum Benchmarking Initiative (QBI).